Introduction

Raymont, J. E. G.

doi:10.1016/b978-0-08-021551-8.50006-1

Cited by 23 publications

(40 citation statements)

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“…Examples for seasonal succession of species probably caused by different patterns of reproduction are found in a number of coastal/neritic systems: Eurytemora affinis /Acartia tonsa (Hirche 1992), A. longiremis /A. clausi (Eriksson 1973, Ianora & Buttino 1990, and multi-species succession (Raymont 1983). On the other hand, Kiørboe & Nielsen (1994) observed synchronous peaks in egg production for several calanoid copepod species in the Kattegat, following peaks of phytoplankton abundance.…”

Section: Introductionmentioning

confidence: 99%

“…were present throughout the year, whereas the 2 Centropages congeners showed a summer/winter succession. C. typicus is considered an immigrant which is brought regularly to the North Sea in autumn by advection of Atlantic waters (Raymont 1983, Fransz et al 1991. This species occurred only at the end of September, when the other species had more or less completed reproduction.…”

Section: Seasonal Reproductive Cycles and Reproductive Strategiesmentioning

confidence: 99%

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Reproductive cycles of dominant calanoid copepods in the North Sea

Halsband¹,

Hirche

2001

Mar. Ecol. Prog. Ser.

103

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The seasonal cycles of reproduction of the dominant copepods Acartia clausi, Temora longicornis, Centropages hamatus, C. typicus and Pseudocalanus spp. were studied at Helgoland Roads, southern North Sea. Egg production rate, clutch size, number of spawning females and prosome length were compared with temperature and phytoplankton concentration. Female A. clausi, T. longicornis and Pseudocalanus spp. were present all year round. T. longicornis and Pseudocalanus spp. bred continuously throughout the year, although egg production rates and the proportion of spawning females were low in winter. A. clausi did not spawn between the end of September and the end of January. Female C. hamatus were absent from the water column from November to May, and C. typicus from February to August. As the latter 3 species spawn year round in warmer regions, low temperature inhibition of reproduction is suggested for Helgoland, where winter temperatures are below 0°C. Maximum egg production was observed in all species, except the late-arriving C. typicus, in April/May, when females were largest. Significant correlations were only obtained between clutch size or egg production rate and prosome length, which in turn was correlated with temperature. It is therefore concluded that for Helgoland waters temperature controlled egg production by its effect on prosome length, and that food conditions were not limiting.

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Section: Introductionmentioning

confidence: 99%

Section: Seasonal Reproductive Cycles and Reproductive Strategiesmentioning

confidence: 99%

Reproductive cycles of dominant calanoid copepods in the North Sea

Halsband¹,

Hirche

2001

Mar. Ecol. Prog. Ser.

103

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“…This limits their foraging range (Boyd 1998) which means there is greatest potential for local inter-and intra-specific competition during summer when offspring are reared. Their absence from the island of South Georgia in winter may indicate that they migrate to forage in other regions thus avoiding local competition for resources at a time of year when zooplankton growth and reproduction are low (Raymont 1983). Summer krill abundance in the region around South Georgia also varies between years (Brierley et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Distribution of foraging by female Antarctic fur seals

Boyd

Staniland²,

Martin³

2002

Mar. Ecol. Prog. Ser.

100

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The study examined the distribution of critical habitat for foraging by female Antarctic fur seals breeding at the island of South Georgia. Bathymetric features of the continental shelf around the island of South Georgia were an important indicator for the localisation of foraging. This pattern was consistent among years of different prey availability. Lactating females were constrained to forage mainly within 100 km of the location at which the offspring was being raised. When this constraint was removed at the end of lactation, females foraged to much greater ranges and dispersed to specific regions of the continental shelf east of Patagonia (>1000 km) and to the northern edge of the Antarctic pack ice (500 km). The empirical distribution of foraging during the breeding season was used to develop a function that described the foraging distribution for the whole breeding population of females. The result was consistent with past observations from ship-based surveys and it allowed estimation of the spatial impact of breeding female fur seals on krill at South Georgia. This suggested that, in extreme cases and assuming that krill influx is limited, female fur seals could eat most of the krill present in some regions where they forage intensively. However, mean consumption was about one-tenth of the mean density of krill.

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“…Exchange of PCBs between copepods and the dissolved pool was modeled as a first-order process, with additional PCB accumulation from ingested phytoplankton and other particles. Calanoid copepods are primarily herbivorous [27], although they may obtain some energy from detritus [28,29]. In the Mediterranean, phytoplankton biomass is low, so including other particles in the diet may have a substantial effect on predicted PCB accumulation.…”

Section: Pcb Accumulation In Mediterranean Calanoid Copepodsmentioning

confidence: 99%

Exploring the effects of consumer–resource dynamics on contaminant bioaccumulation by aquatic herbivores

Spencer

Fisher

Wang

1999

Enviro Toxic and Chemistry

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Abstract-We explore the consequences of consumer-resource interactions for bioaccumulation in two aquatic systems (cadmium accumulation in Dreissena polymorpha and polychlorinated biphenyl accumulation in calanoid copepods). We explicitly link the feeding and growth rates of consumers to the abundance of resources under a variety of assumptions about the nature of the interactions between them. The models are parameterized using field and laboratory data, and predictions are quantitatively compared with field-measured distributions of tissue concentrations. Different assumptions about consumer-resource interactions result in different predicted distributions of tissue concentrations and illustrate the way these interactions constrain the bioaccumulation of contaminants. Linking feeding and growth rates to resource abundances will be important whenever these abundances change over time. User-friendly software will make these ideas accessible to nontheoreticians.

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Introduction

Cited by 23 publications

References 0 publications

Reproductive cycles of dominant calanoid copepods in the North Sea

Reproductive cycles of dominant calanoid copepods in the North Sea

Distribution of foraging by female Antarctic fur seals

Exploring the effects of consumer–resource dynamics on contaminant bioaccumulation by aquatic herbivores

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